Raspberry Pi Official Pi3 Micro USB EU Power Supply 5.1V 2.5A (White)

You'll need a USB Type C adapter to use this supply for Pi 4

This PSU supports up to 2.5A of current, so it won't let you down when powering hungry devices through your Raspberry Pi 3 Model B

Technical Data

• 5.1V 2.5A Output
• 1.5m Cable
• Black with Raspberry Pi Logo
• Input Voltage AC Max: 264V
• Input Voltage AC Min: 90V
• Output Connector: USB Micro
• Output Voltage Nom.: 5.1V
• Interchangeable Adaptor - EU/UK
  
  The below is a copy from https://www.raspberrypi.org/help/faqs/#powerReqs.

  Here is a table comparing the amount of power drawn in amps under different situations:

  Note: Stock is currently available in South Africa for national shipping!&l

  		Pi1 (B+)	Pi2 B	Pi3 B (Amps)	Zero (Amps)
  Boot	Max	0.26	0.40	0.75	0.20
  	Avg	0.22	0.22	0.35	0.15
  Idle	Avg	0.20	0.22	0.30	0.10